Assume the standard deviation of the heights of all five-year-old boys is 3.5 inches. How many five-year-old boys need to be sampled if we want to be 80% sure that the population mean height is estimated correctly to within 0.5 inches? OOOO 325 189 133 81 102

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A: a) The distribution of x is normal distribution. x~Nμ ,σ2

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A: Given: μ=2031,σ=570

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